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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25da69be1f732760495b1413dcb605a0e5d3b36388d85ce76eede28580b5fb1f' 
  AND token = '4MeU63mfHfsxx195Ee/wTGZ3QWUwwBNjJHFqKeI+QrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}